Revision on Tooth Preparations PDF

REVISION ON TOOTH PREPARATIONS Prof. Waleed Elshahawy BDS, MSc, PhD, NBDE Types of Tooth Preparations for Full Coverage Restorations to be Done: 1. All-Ceramic Crown 2. Metal – Ceramic Crown Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Cli...

REVISION ON TOOTH PREPARATIONS Prof. Waleed Elshahawy BDS, MSc, PhD, NBDE Types of Tooth Preparations for Full Coverage Restorations to be Done: 1. All-Ceramic Crown 2. Metal – Ceramic Crown Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Clinical procedures to prepare the tooth: 1. Occlusal guiding grooves. 2. Occlusal reduction. 3. Axial alignment grooves. 4. Axial reduction. 5. Finishing 6. Evaluation Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Occlusal Guiding Grooves Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Guiding grooves are placed on occlusal surface Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Occlusal Reduction Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE  After guiding grooves are placed, occlusal reduction is performed.  Either the mesial or distal half is maintained initially as a reference. Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Is it a must to do “Anatomical Occlusal Reduction”? 1. Conservative for tooth structure 2. Avoid pulp involvement 3. Gives rigidity to restoration because of “Corrugated effect” of planes Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE After completed occlusal reduction, functional cusp bevel is placed Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Evaluation of Adequacy of Occlusal Clearance 1. Utility wax 2. Occlusal reduction gauge 3. Silicon index Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Axial Alignment Grooves Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE  Three alignment grooves are placed in each buccal & lingual wall. One in center & one in each mesial & distal transitional line angle. Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE  Axial Reduction Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE  Axial reduction is completed first on either distal or mesial half of tooth. The remaining intact tooth can serve as a reference. Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Tooth preparations must account for the geometry of the pulp chamber Reduce tooth while you think about dentine thickness and pulp involvement Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE How to achieve correct convergence angle?! Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE How to have guide for correct convergence angle?! Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE  A metal matrix band placed around the adjacent tooth for protection The thin band can be perforated and the underlying enamel damaged. Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE The preferred method is to use the proximal enamel of the tooth that is being prepared for protection of the adjacent. Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE  Margin Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE  1mm Shoulder Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE  Finishing Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE All sharp angles and corners of the preparation must be rounded off Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE  Use Fine Grit Diamond Bur for Preparation Finishing Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Difference between teeth preparations of All-Ceramic and Metal-Ceramic Prof. Waleed Elshahawy, BDS, MSc, PhD, NBDE Thank You Dr. Waleed Elshahawy, BDS, MSc, PhD